Computer Interfacing
Discussions about interfacing and electronics

TRA, TRB in RS485?


       Computer Interfacing Forum Index -> RS422 and RS485
Author Message

Oct 22, 2010 9:04 am

Hi, everybody!
What does TRA(TRB) stand for? Which one is positive signal and which one is negative signal?
Thanks all!

Oct 19, 2011 2:42 pm

Transmit A and Transmit B. The signal is effectively push-pull and the A output is the non-inverting output. The Receive A pin is the one which in a failsafe device will be held mark high, signal idle state, if all transmitters on the bus are in their high impedance state.

       Computer Interfacing Forum Index -> RS422 and RS485
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